I'd imagine as being mature with class. Perhaps one of the oldest beings in Gensokyo (though I'm not sure, a few others have lived over 1200 years as well). I'd expect sophistication, often talking to you with a amused look on her face and a knowing smile.

>>9557679Personally I find it somewhat fitting because Yukari is described as being somewhat childish in her mannerisms. It's supposed to feel like she's always making fun of you when she talks without overtly saying anything.

This is actually something I've come to like most about Yukari. Laid back attitude aside she's extremely intelligent and thinks outside of the box, perhaps even the room the box is in. It's hard to fully understand the motives in her actions but at the very least you know she's dedicated to Gensokyo.